JPH08198181A - Scuba primary pressure reducer - Google Patents

Abstract

PURPOSE: To easily maintain and control a scuba primary pressure reducer. CONSTITUTION: A primary pressure reducer F is provided with a loaded section loaded in the valve body 2 of a cylinder 1 and an air intake port 4c for intaking air supplied from the valve body 2. An inner cap 6 for closing the air intake part 4c is elastically brought into contact with the inner end portion fo the air intake port 4c by a spring 7. The inner cap 6 is provided with an engaging shaft section 6b extending to the front of the air intake port 4c. The engaging shaft section 6b is pushed backward by the valve body 2 when the primary pressure reducer F is loaded in the valve body 2. Thus, a disk section 6a shifts away from the air intake port 4c, enabling air from the cylinder 1 to flow in. When the primary pressure reducer F is removed from the valve body 2, the disk section 6a closes the air intake port 4c from the inside by means of the pressing force of the spring 7 and thereby infiltration of water or dusts is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary pressure reducer for scuba.

[0002]

2. Description of the Related Art A regulator used in scuba diving is mounted on an air cylinder for scuba, and a primary pressure reducer (1st stage) for reducing the high pressure air supplied from the cylinder to a medium pressure of about 10 atmospheres, It is provided with a secondary pressure reducer (2nd stage) for reducing the medium pressure air supplied from the primary pressure reducer to the same pressure as the water pressure in the dive.

There are various types of primary pressure reducers such as piston type and diaphragm type. In each case, the primary pressure reducer is fixed to the valve body of a scuba cylinder, and an air intake port is provided from this cylinder. The basic structure is one that takes in air inside.

When the regulator is not used, the primary decompressor is removed from the cylinder for transportation and storage. When the primary decompressor is removed from the cylinder, the air intake port becomes open, so cover this opening with a lid (dust cap) made of plastic or hard rubber to prevent water or dust from entering. There is.

[0005]

As described above, in the case where the primary decompressor is covered with the dust cap when the primary pressure reducer is removed from the cylinder, the following inconvenience occurs. First of all, there is a risk of forgetting to put on the dust cap. Secondly, if the dust cap is not properly covered, water or dust may enter. Third
In addition, the dust cap may be covered with water, dust, and the like. Fourth, the dust cap may come loose during transportation, and so on.

For the above-mentioned reasons, if seawater, dust, or the like enters the primary pressure reducer, the internal operating parts may not operate normally, or water may enter the residual pressure gauge and cause corrosion. Therefore, an object of the present invention is to facilitate maintenance and management of the regulator by adopting a configuration in which the air intake is inevitably closed from the inside when the primary pressure reducer is removed from the cylinder.

[0007]

In order to achieve the above object, the primary decompressor of the present invention has a mounting portion for mounting on the valve body, and a valve body with the mounting portion mounted on the valve body. An air intake port for taking in the air supplied from is provided, and an inner cap that is closed from the inside is elastically contacted to this air intake port through an elastic member. The inner cap is provided with an engagement shaft portion that extends forward through the air intake port.
With the attachment part of the next decompressor attached to the valve body of the cylinder,
It has a length sufficient to engage a part of the valve body and withdraw the inner cap against the biasing force of the elastic member.

[0008]

When the primary decompressor is removed from the cylinder, the inner cap is pressed against the inner end of the air intake port by the urging force of the elastic member and is closed from the inside, so that seawater, dust, etc. Prevent intrusion. When the primary pressure reducer is attached to the valve body via the attachment portion, the engaging shaft portion of the inner cap is pushed. Therefore, the inner cap moves backward against the biasing force of the elastic member, the air intake port is unblocked, and air can be supplied from the cylinder. When the primary pressure reducer is removed from the cylinder, the inner cap again closes the air intake port by the urging force of the elastic member.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which the primary pressure reducer F is about to be mounted on the scuba cylinder. As shown in the figure, a valve body 2 for removing high pressure air is provided upright on the top of the cylinder 1. A valve 3 is provided at an intermediate position of the valve body 2 so that the high pressure air in the cylinder can be supplied and stopped. A mounting member 2a for mounting the primary pressure reducer F is provided near the upper end of the valve body 2. Primary decompressor body 4 forming the main part of the primary decompressor
Is mounted on the mounting member 2a by a fixing screw 5 via a mounting portion 14 described later.

The primary decompressor body 4 has a horizontal chamber 4a which becomes horizontal when the cylinder 1 is placed vertically.
And a vertical chamber 4b which is located at the tip thereof and which is provided perpendicularly to the horizontal chamber 4a. A cylindrical air intake port 4c is formed at the center of the end plate portion provided on the end surface of the horizontal chamber 4a on the valve body side (left in FIG. 1).

An inner cap 6 is attached to the inner end of the air intake port 4c to close the air intake port from the inside of the primary pressure reducer body 4. The inner cap 6 is formed so as to extend forward in the air intake port 4c from the center of one surface of the disk part 6a that closes the inner end portion of the air intake port 4c. The engaging shaft portion 6b.

One end of the compression coil spring 7, which is an elastic member, is in contact with the other surface of the disc portion 6a of the inner cap 6, and the disc portion closes the air intake port 4c from the inside. . The spring 7 is supported by a receiving portion 4d provided inside the primary pressure reducer body 4 and
Inner cap 6 so that it is covered from the inside
Is elastically contacted with the inner end of the air intake port 4c by a biasing force.

Inside the vertical chamber 4b provided below the right end of the primary pressure reducer body 4 is a cylinder chamber, in which a piston 8 is slidably mounted. A cylinder portion 8a is erected at the center of the upper side of the piston 8, and this cylinder portion is provided with a partition plate portion 4e that partitions the horizontal chamber 4a and the vertical chamber (cylinder chamber) 4b of the primary pressure reducer body 4 from each other. Through hole 4f
And its tip is located in the vicinity of the ceiling of the horizontal chamber 4a. Sealing materials (O-rings) 15 and 16 are provided on the through hole 4f of the partition plate portion 4e and on the outer periphery of the piston 8 so that airtightness is maintained respectively. A ventilation hole 8c penetrates through the piston 8 and the cylindrical portion 8a, and the lower portion of the piston 8 of the horizontal chamber 4a and the vertical chamber 4b can communicate with each other through the ventilation hole. Tube part 8a
A conical concave portion 8d is formed at the tip end of the, and a conical projection 4g is formed at the ceiling portion of the horizontal chamber 4a located in front of the conical concave portion 8d. As a result, the piston 8 rises and the projection 4
When g and the conical concave portion 8d are engaged, the flow of air is weakened and the pressure is lowered, and the air flow rate is increased as the piston 8 is lowered.

A coil spring 9 is mounted between the upper side of the piston 8 and the partition plate 4e so as to urge the piston downward. Coil spring 9 has no water pressure
At this time, the urging force is adjusted so that the air pressure in the lower part of the piston 8 of the vertical chamber 4b becomes about 10 atm.

A communication hole 4h for communicating with the outside air is provided in the upper wall portion of the vertical chamber 4b, and the piston 8 of the vertical chamber 4h is provided during diving.
Water pressure can be applied to. This water pressure and coil spring 9
The urging force of (1) balances the air pressure from the cylinder described above to raise and lower the piston 8 and adjust the air flow rate. That is, when the diving depth is shallow, the water pressure is low, so the air pressure reduces the air flow rate when the piston 8 comes to the raised position due to the air pressure. On the other hand, when the diving depth is deep, the water pressure becomes high, and the piston 8 descends against the air pressure, so that the air flow rate becomes large.

A medium pressure hose 10 and an octopus hose 11 (see FIG. 3) for sending depressurized air to a secondary pressure reducer (not shown) are respectively connected to the wall portion near the bottom of the vertical chamber 4b via joints. Are linked together. A hose 13 for the residual pressure gauge 12 is connected to the side wall of the horizontal chamber 4a.

Next, the mounting state of the primary pressure reducer F on the scuba cylinder 1 will be described. A mounting portion 14 for mounting on a cylinder is rotatably provided on the end surface of the primary pressure reducer body 4 on the air intake port 4c side with respect to the primary pressure reducer body 4. Therefore, the primary pressure reducer body 4 can be rotated to a position where it can be easily used when it is attached to the valve body 2. The fixing screw 5 described above is screwed into the eye screw provided on the curved portion of the U-shaped portion 14a (see FIG. 2).

At a position facing the air intake port 4c of the primary pressure reducer main body in the mounting portion 2a of the valve main body 2, a spherical concave portion 2 for receiving the tip of the engaging shaft portion 6b of the inner cap 6 is formed.
b is formed. The spherical concave portion 2b has a high-pressure air outlet portion 2c for communicating the valve body 2 with the air intake port 4c.
Is provided.

FIG. 2 shows a state in which the primary pressure reducer F is attached to the air cylinder 1. When the mounting portion 14 is aligned with the mounting position of the valve body 2, the mounting portion 2a of the valve body is sandwiched between the mounting portion 2a and the tip of the fixing screw 5, and the fixing screw 5 is rotated and tightened, the primary pressure reducer body 4 is moved relative to It moves and approaches the valve body 2 side, and is fixed in a state of being in contact with the outer end portion of the air intake port 4c.

At this time, the engaging shaft portion 6 of the inner cap 6 which has been extended in front of the air intake port 4c.
The tip of b comes into contact with the valve body 2, and in this state, the primary pressure reducer body 4 and the valve body 2 further approach each other, so that the inner cap 6 moves backward against the biasing force of the spring 7. For this reason,
A gap is formed between the disk portion 6a that was in contact with the inner end of the air intake port 4c and the air intake port 4c, and air can flow in. This inner cap 6 is a primary pressure reducer F.
When the valve is removed from the cylinder 1, the valve body 2 pushing the engagement shaft portion 6b disappears, so that the inner cap 6 is again brought into contact with the inner end portion by the biasing force of the spring 7 to close the air intake port 4c from the inside. It has become. In this way, when the primary pressure reducer is removed from the cylinder, the air intake 4c is inevitably closed by the inner cap 6, so that there is no risk of water, dust, etc. entering the primary pressure reducer body 4. .

In this embodiment, the engaging shaft portion 6b of the inner cap 6 is extended so as to project outward from the air intake port 4c, but the conical concave portion 2b of the valve body 2 is a conical protruding portion. Even if the engagement shaft is retracted inward from the outer end of the air intake port, the inner cap can be retracted. The present invention can be applied to various types such as a piston type and a diaphragm type other than the primary pressure reducer shown in this embodiment. Further, the method of attaching the primary pressure reducer to the valve body is not limited to the screw type of the present embodiment, but can be applied to various other types.

[0022]

As described above, according to the present invention, since the inner cap biased so as to close the intake port of the primary pressure reducer body from the inside is provided, when the primary pressure reducer is removed from the cylinder. Inevitably the air intake is blocked. For this reason, water, dust, etc. do not enter the main body of the primary decompressor, so even if you forget to cover the cap, it will not corrode internal components or damage instruments. This makes it easy to maintain and manage the regulator.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing a state before a primary pressure reducer is attached to a cylinder.

FIG. 2 is a partially cutaway sectional view showing a state in which a primary pressure reducer is attached to a cylinder.

FIG. 3 is a plan view showing a state in which a primary pressure reducer is attached to a cylinder.

[Explanation of symbols]

 F Primary decompressor 1 Cylinder 2 Valve body 4 Primary decompressor body 4c Air intake 6 Inner cap 6b Engaging shaft 7 Elastic member 14 Mounting part

Claims (1)

[Claims] 1. A primary decompressor for a scuba, which is mounted on a valve body of a scuba cylinder to decompress high-pressure air in the cylinder, wherein the primary decompressor body is mounted on the valve body. And an air intake port for taking in air supplied from the valve body while being attached to the valve body, and the air intake port is an inner member that closes the air intake port from the inside. The cap is elastically contacted via an elastic member, and the inner cap is provided with an engagement shaft portion that extends forward through the air intake port. A portion long enough to engage the part of the valve body with the valve body mounted to the valve body and to retract the inner cap against the biasing force of the elastic member. Characteristic scuba The primary pressure reducer.